EP1411588B1 - Antenne à large bande - Google Patents

Antenne à large bande Download PDF

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Publication number
EP1411588B1
EP1411588B1 EP03023406A EP03023406A EP1411588B1 EP 1411588 B1 EP1411588 B1 EP 1411588B1 EP 03023406 A EP03023406 A EP 03023406A EP 03023406 A EP03023406 A EP 03023406A EP 1411588 B1 EP1411588 B1 EP 1411588B1
Authority
EP
European Patent Office
Prior art keywords
inter
substrate
segment
collinear antenna
series
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03023406A
Other languages
German (de)
English (en)
Other versions
EP1411588A1 (fr
Inventor
Daniel Wang
Robert Daly
Steve Jaques
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RF Industries Pty Ltd
Original Assignee
RF Industries Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RF Industries Pty Ltd filed Critical RF Industries Pty Ltd
Publication of EP1411588A1 publication Critical patent/EP1411588A1/fr
Application granted granted Critical
Publication of EP1411588B1 publication Critical patent/EP1411588B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/40—Radiating elements coated with or embedded in protective material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/40—Element having extended radiating surface

Definitions

  • the present invention relates to antenna devices, and, more particularly to collinear antennas.
  • Series collinear antenna segments are well known in the field of antenna design (for example, the US patent application GB 2030778 A which describes an antenna which is suitable for multiple frequency utilization). They have a number of advantages over other collinear antenna strategies such as a corporate feed collinear because of their ease of construction and associated affordability. They consist of a number of alternate radiating elements and inter-element phasing sections resulting in a phased array antenna.
  • Each radiating element is optimally fed in phase so that each of the radiating elements will radiate in unison. This enables the focussing of the antenna radiation pattern.
  • Each individual radiating element is designed to be of a specific physical length in order to provide the most effective radiation of power for a given wavelength.
  • Following each active radiating element is an inter-element phasing section, wherein the radiation from the antenna is suppressed until the next correct phase point on the wavefront is reached, wherein another radiating element is fed in series.
  • the ideal theoretical inter-element phasing section would see the suppression of 1 ⁇ 2 ⁇ (180 degrees of phase) of the wave front, where ⁇ is the design wavelength for the antenna.
  • ⁇ is the design wavelength for the antenna.
  • the physical length of the radiating element should be 1 ⁇ 2 ⁇ .
  • the ideal theoretical physical spacing between the two radiating elements would be % ⁇ as measured from the top of one radiating element to the bottom of the next radiating element.
  • there are competing design constraints here which make realisation of the theoretical ideal difficult.
  • users require coverage over a range of wavelengths. When the wavelength in use changes from the design wavelength, the side lobes of the antenna radiation pattern become more pronounced. Also elevation tilt in the radiation pattern is induced when the individual radiating elements are not fed precisely in phase with each other.
  • Another further approach to approximate a coil is to implement a meander on a flat circuit board. This does provide a high inductance, lower capacitance inter-element phasing section due to the low capacitance of the tracks on the circuit board but consequently the matching ability of a flat meander is significantly degraded. This is because the radiating elements and the flat meander are not well de-coupled from each other and hence the definition between these two components of a series collinear antenna segment is poor, resulting in reduced bandwidth and performance. Consequently this approach is used only for smaller, lower gain antennas, where performance is not critical. Other electrical components can be added to series collinear antenna segments which use a flat meander inter-element phasing section to introduce the desired capacitance. However, this results in significantly increased costs of production.
  • the present invention provides a series collinear antenna segment, including a plurality of radiating elements and inter-element phasing sections, arranged alternately on a single sided elongated substrate, wherein said segment is adapted to be operatively curved in an at use configuration about a longitudinal axis running substantially along the length of said segment, and wherein said inter-element phasing sections are operatively adapted to allow said radiating elements to radiate electromagnetic radiation substantially in phase over an intended range of frequencies.
  • the present invention enables a number of advantages to be realized when compared with the prior art.
  • the present invention has improved broad band characteristics when compared to standard design series collinear antenna segments implemented in a flat configuration on a standard PCB substrate.
  • the curving of the substrate provides for increased capacitance providing a more improved inter-element phasing section.
  • the inter-element phasing sections and radiating elements are arranged so that operatively they face substantially perpendicular to each other. This provides excellent decoupling between the radiating and passive sections of the series collinear antenna segment further improving the performance.
  • the inter-element phasing sections include a conductive track arranged to follow a serpentine path. This is a cost effective technique for introducing phase differences between radiating elements.
  • the segment consists of a first radiating element 20, an inter-element phasing section 30 and a further radiating element 40 identical in dimension to the first radiating element 20. It is understood that further phasing sections and radiating elements may be added as is required. These elements consist of a conductive material such as copper disposed upon a single sided flexible continuous substrate 1. An example of a suitable substrate is standard flexible PCB material. In other embodiments the conductive material can be gold.
  • the geometry of a radiating element is primarily dependent upon the target design wavelength ⁇ intended for the series collinear antenna segment.
  • a segment suitable for use in an antenna designed for a target wavelength of 34 cm (equivalent frequency 890 MHz) and with a bandwidth of 15 % is described.
  • Such an antenna is capable of providing satisfactory performance over both CDMA and GSM wavelength bands. It will be readily apparent that the invention described here can be used for many different combinations of target wavelength and bandwidth ranges.
  • the vertical length of the radiating elements 20 and 40 are approximately 1 ⁇ 2 ⁇ .
  • broad theoretical design principles set out that the horizontal width of the radiating elements 20 and 40 that is required should be approximately 1/16 ⁇ .
  • Inter-element phasing section 30 includes a feed entry point 31. Extending vertically between radiating element 20 and feed entry point 31 there is a lead-in track 38. Furthermore, inter-element phasing section 30 includes a feed exit point 32 from which a lead-out track 39 extends vertically from the inter-element phasing section 30 to the radiating element 40. Between the feed entry point 31 and the feed exit point 32 the conductive track follows a serpentine path starting with a first horizontal section 34 followed by a vertical section 35 and then a horizontal section 36 returning to a central position defined by a line extending between the feed entry point 31 and feed exit point 32. This path repeats a number of times until the feed exit point 32 is reached.
  • the length of the vertical section between each horizontal track section 33 is equal to the width of the track.
  • the track width of the inter-element phasing section 30, lead-in track 38 and lead-out track 39 are substantially equal to each other.
  • the horizontal width of the track is comparable to the horizontal width of the radiating section.
  • the vertical length of the inter-element phasing section (defined as the length between feed entry point 31 and feed exit point 32) is approximately 1/4 ⁇ .
  • Figure 2 illustrates the collinear antenna segment 1 as curved to an in-use configuration ready to be inserted into a radome 50 having an inside diameter of 14 mm which is typical for antennas designed for the wavelength range of interest here.
  • the flexible substrate curves substantially so that the antenna segment 1 can conform to the cylindrical shape of the radome 50.
  • the substrate is provided with an adhesive to secure the substrate to the inner surface of the radome 50.
  • the curved inter-element phasing section 30 introduces a degree of capacitance which improves the broad band characteristics substantially over a similar design implemented in a flat configuration while still maintaining the overall capacitance to a manageable level.
  • the inter-element phasing section 30 has reduced sensitivity to wavelength and hence exhibits a lower phase angle change for a given variation in the operating wavelength. This can be compared to when the substrate is in the flat configuration as depicted in Figure 1, where there is minimal parasitic capacitance between the tracks resulting in the inter-element phasing section 30 not exhibiting enough internal parasitic capacitance to provide satisfactory matching.
  • Figure 3 depicts an enlarged view of the transition region between inter-element phasing section 30 and radiating element 40 when the series collinear antenna segment is in the in-use configuration.
  • a first construction plane 70 defined by the opposed edges of the radiating element when in the curved in-use configuration.
  • a second construction plane 60 defined by the opposed edges of the inter-element phasing section. Construction planes 70 and 60 intersect each other at approximately 90 degrees, in this example. This is due to the positioning of the inter-element phasing section 30 which is offset to one side of the flexible substrate 1 from radiating elements 20 and 40.
  • the curving of the substrate is predominantly defined by the cylindrical shape of the radome 50.
  • the collinear antenna segment 1 can be arranged directly onto the inner surface of the radome 50.
  • the cylindrical shape of the radome 50 would define the curved in-use configuration of the collinear antenna segment 1.

Landscapes

  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Waveguide Aerials (AREA)
  • Support Of Aerials (AREA)

Claims (7)

  1. Segment (10) d'antenne colinéaire en série, comprenant une pluralité d'éléments rayonnants (20, 40) et une section (30) de mise en phase entre éléments disposée en alternance sur un substrat (1) allongé monoface, caractérisé en ce que le segment (10) est adapté pour être incurvé fonctionnellement dans une configuration d'utilisation autour d'un axe longitudinal s'étendant sensiblement le long du segment (10), et en ce que la section (30) de mise en phase entre éléments est adaptée fonctionnellement pour permettre aux éléments rayonnants (20, 40) d'émettre un rayonnement électromagnétique sensiblement en phase dans une plage de fréquences prévue, le substrat (1) étant flexible ; et la section de mise en phase entre éléments (30) étant décalée latéralement et d'un côté d'un axe longitudinal s'étendant sensiblement au centre du substrat (1) de telle sorte que l'angle entre une tangente de l'élément rayonnant incurvé (20, 40), au niveau du centre de l'élément, et la section de mise en phase entre éléments (30) puisse être ajustée en faisant varier le degré de courbure du substrat flexible (1) afin de régler le degré de couplage entre la section de mise en phase entre éléments (30) et l'élément rayonnant (20, 40) en le faisant passer d'une valeur minimum à 90 degrés à une valeur plus importante, à moins de 90 degrés.
  2. Segment (10) d'antenne colinéaire en série selon la revendication 2, caractérisé en ce que le substrat (1) inclut un adhésif pour fixer ce substrat (1) sur une surface.
  3. Segment (10) d'antenne colinéaire en série selon la revendication 1, caractérisé en ce que le substrat est un radome (50) et en ce que le segment (10) est disposé sur une surface intérieure du radome (50).
  4. Segment (10) d'antenne colinéaire en série selon l'une quelconque des revendications précédentes, caractérisé en ce que la section de mise en phase entre éléments (30) est décalée latéralement et d'un côté d'un axe longitudinal s'étendant sensiblement au centre du substrat (1) de telle sorte que les éléments rayonnants (20, 40) et les sections de mise en phase entre éléments (30) se trouvent fonctionnellement les uns en face des autres et de façon sensiblement perpendiculaire les uns par rapport aux autres.
  5. Segment (10) d'antenne colinéaire en série selon l'une quelconque des revendications précédentes, caractérisé en ce que la section de mise en phase entre éléments (30) comprend une piste conductrice conçue pour suivre une trajectoire en spirale.
  6. Antenne colinéaire en série alimentée aux extrémités comprenant au moins un segment (10) d'antenne colinéaire en série selon l'une quelconque des revendications 1 à 5.
  7. Antenne colinéaire en série alimentée au centre comprenant au moins un segment (10) d'antenne colinéaire en série selon l'une quelconque des revendications 1 à 5.
EP03023406A 2002-10-17 2003-10-17 Antenne à large bande Expired - Lifetime EP1411588B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2002952142 2002-10-17
AU2002952142A AU2002952142A0 (en) 2002-10-17 2002-10-17 Broad band antenna

Publications (2)

Publication Number Publication Date
EP1411588A1 EP1411588A1 (fr) 2004-04-21
EP1411588B1 true EP1411588B1 (fr) 2006-12-13

Family

ID=28047708

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03023406A Expired - Lifetime EP1411588B1 (fr) 2002-10-17 2003-10-17 Antenne à large bande

Country Status (6)

Country Link
US (1) US6909403B2 (fr)
EP (1) EP1411588B1 (fr)
CN (1) CN100502145C (fr)
AT (1) ATE348415T1 (fr)
AU (1) AU2002952142A0 (fr)
DE (1) DE60310335T2 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7152593B2 (en) * 2004-04-13 2006-12-26 Pent Technologies, Inc. Ignition terminal
WO2006035241A1 (fr) * 2004-09-30 2006-04-06 Radioscape Limited Antenne bi-bande
KR100731600B1 (ko) * 2005-12-26 2007-06-22 (주)에이스안테나 상호 보완적인 방사체 구조의 내장형 칩안테나
DE102009004024A1 (de) 2008-10-30 2010-05-06 Rohde & Schwarz Gmbh & Co. Kg Tragbare Zweiband-Antenne
US10141645B2 (en) * 2016-03-10 2018-11-27 Rf Industries Pty Ltd Multiband antenna
WO2018065404A1 (fr) 2016-10-08 2018-04-12 Philips Lighting Holding B.V. Dispositif d'éclairage tubulaire comprenant une antenne colinéaire en série
CN110212315B (zh) 2018-02-28 2022-02-22 深圳市海能达通信有限公司 共线天线组件及串馈全向共线天线阵列
CN113964488A (zh) * 2020-07-21 2022-01-21 富士康(昆山)电脑接插件有限公司 天线

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4229743A (en) * 1978-09-22 1980-10-21 Shakespeare Company Multiple band, multiple resonant frequency antenna
GB2299455B (en) * 1995-03-31 1999-12-22 Motorola Inc Self phased antenna element with dielectric and associated method
SE509638C2 (sv) * 1996-06-15 1999-02-15 Allgon Ab Meanderantennanordning
US6075488A (en) * 1997-04-29 2000-06-13 Galtronics Ltd. Dual-band stub antenna
JP3788115B2 (ja) * 1999-07-23 2006-06-21 松下電器産業株式会社 アンテナ装置の製造方法
US6642895B2 (en) * 2000-03-15 2003-11-04 Asulab S.A. Multifrequency antenna for instrument with small volume
US6642893B1 (en) * 2002-05-09 2003-11-04 Centurion Wireless Technologies, Inc. Multi-band antenna system including a retractable antenna and a meander antenna

Also Published As

Publication number Publication date
US6909403B2 (en) 2005-06-21
CN100502145C (zh) 2009-06-17
DE60310335D1 (de) 2007-01-25
US20050001783A1 (en) 2005-01-06
ATE348415T1 (de) 2007-01-15
DE60310335T2 (de) 2007-10-04
AU2002952142A0 (en) 2002-10-31
CN1497773A (zh) 2004-05-19
EP1411588A1 (fr) 2004-04-21

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